| 摘要 |
A fluid flow device having a housing with a movable piston therein for indicating the rate of fluid flowing through the housing. A tapered member is on the outside of the housing and moves therealong through the provision of a magnet on the piston and a piece of magnetically responsive metal on the tapered member. Two electric switches are disposed adjacent the tapered member and have actuating arms in contact therewith for moving the electric points on the switches in accordance with the movement of the tapered member along the fluid housing. Electric signals and electric motors are connected with the switches for respectively indicating the condition of the switches and controlling the electric motors and thus controlling the flow of fluid in the system. A graduated scale is on the housing for indicating the rate of flow through the housing, by means of the tapered member moving along the scale in accordance with that rate of flow.
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